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467739baf6
The driver relies on netdev_get_num_tc() to get the number of HW
offloaded mqprio TCs to allocate and free TX rings. This won't
work and can potentially crash the system if software mqprio or
taprio TCs have been setup. netdev_get_num_tc() will return the
number of software TCs and it may cause the driver to allocate or
free more TX rings that it should. Fix it by adding a bp->num_tc
field to store the number of HW offload mqprio TCs for the device.
Use bp->num_tc instead of netdev_get_num_tc().
This fixes a crash like this:
BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 42b8404067 P4D 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 120 PID: 8661 Comm: ifconfig Kdump: loaded Tainted: G OE 5.18.16 #1
Hardware name: Lenovo ThinkSystem SR650 V3/SB27A92818, BIOS ESE114N-2.12 04/25/2023
RIP: 0010:bnxt_hwrm_cp_ring_alloc_p5+0x10/0x90 [bnxt_en]
Code: 41 5c 41 5d 41 5e c3 cc cc cc cc 41 8b 44 24 08 66 89 03 eb c6 e8 b0 f1 7d db 0f 1f 44 00 00 41 56 41 55 41 54 55 48 89 fd 53 <48> 8b 06 48 89 f3 48 81 c6 28 01 00 00 0f b6 96 13 ff ff ff 44 8b
RSP: 0018:ff65907660d1fa88 EFLAGS: 00010202
RAX: 0000000000000010 RBX: ff4dde1d907e4980 RCX: f400000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ff4dde1d907e4980
RBP: ff4dde1d907e4980 R08: 000000000000000f R09: 0000000000000000
R10: ff4dde5f02671800 R11: 0000000000000008 R12: 0000000088888889
R13: 0500000000000000 R14: 00f0000000000000 R15: ff4dde5f02671800
FS: 00007f4b126b5740(0000) GS:ff4dde9bff600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000416f9c6002 CR4: 0000000000771ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<TASK>
bnxt_hwrm_ring_alloc+0x204/0x770 [bnxt_en]
bnxt_init_chip+0x4d/0x680 [bnxt_en]
? bnxt_poll+0x1a0/0x1a0 [bnxt_en]
__bnxt_open_nic+0xd2/0x740 [bnxt_en]
bnxt_open+0x10b/0x220 [bnxt_en]
? raw_notifier_call_chain+0x41/0x60
__dev_open+0xf3/0x1b0
__dev_change_flags+0x1db/0x250
dev_change_flags+0x21/0x60
devinet_ioctl+0x590/0x720
? avc_has_extended_perms+0x1b7/0x420
? _copy_from_user+0x3a/0x60
inet_ioctl+0x189/0x1c0
? wp_page_copy+0x45a/0x6e0
sock_do_ioctl+0x42/0xf0
? ioctl_has_perm.constprop.0.isra.0+0xbd/0x120
sock_ioctl+0x1ce/0x2e0
__x64_sys_ioctl+0x87/0xc0
do_syscall_64+0x59/0x90
? syscall_exit_work+0x103/0x130
? syscall_exit_to_user_mode+0x12/0x30
? do_syscall_64+0x69/0x90
? exc_page_fault+0x62/0x150
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.